ReduceFiberProof.shift: def of bendtorch-core@0.1.0.0
Import: import bendtorch-core@0.1.0.0/src/autograd/reduce_fiber_proof.bend as ReduceFiberProof
Lines 557-563 of bendtorch-core@0.1.0.0/src/autograd/reduce_fiber_proof.bend: https://jend.leeeet.dev/read.txt?path=bendtorch-core@0.1.0.0/src/autograd/reduce_fiber_proof.bend&start_line=557&end_line=563

import Base

# Moving the base moves every offset: base + xs.
def shift(+base: Nat, xs: List<&2, Nat>) -> List<&2, Nat>:
  match xs:
    case Nil{}:
      Nil{}
    case x <> rest:
      Nat.add(base, x) <> shift(base, rest)

Uses (3):
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=List
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Nat
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Nat.add